This logic is pretty basic for now, it'll have to be expanded a lot to
support the different UX between priv and non-priv installs. For example,
priv updates will be able to happen entirely in the background. Those will
then require leaving a notification to tell the user that the app was
updated so nothing can transparently install updates without the user
knowing. When the user is an active part of each install, like the
non-priv experience requires, then keeping the "app installed" notification
feels like just extra noise.
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